I raced against a T4 with my T3'12 yesterday (due to not having had time to build my T4
And I can tell you those T4s are seriously fast.
The T4 driver was one main below me in a race 2 weeks before (back then driving a T3 as well).
And with the T4 he was on pace with me except for him making 1 or 2 minor driving mistakes per run that i didn't make
I think the T4 is way superior to the T3'12.
Really stoked to build my T4 now
Greets from Germany